Piston.



W. R. HEWITT.

HsToN.

Patented Apr. 1, 1913.

Z SHEETS-SHEET 1.

sures, I have provided a plug or valve 11 which may be suitabl, mounted in the upper end of a tube 5. Tfiis is provided with a central opening 12 to suit the particular pressure employed. yBy reducing the size of the inlet or aperture in this valve or plug, a corresponding change in the amount of steam or other condensed lubricants which enter the inlet chamber will be exerted and will correspondingly regulate and control the amount of lubricant being discharged from the annular grooves 8 and 9 in the hood follower.

When starting the engine ,it is found in practice that there will always be a certain amount of condensed steam or water in the cylinder which will, when pressure is exerted on the piston, be forced through the tubes 5 into the annular chamber 8. This will ll the annular chamber anddischarge through the radial ports 4 into the annular grooves 8 and 9, from where it is forced in a thin layer between the walls of the cylinder and piston. The lubricant being constantly and continuously forced out between the working surfaces under pressure will produce the effect of suspending or floating the piston. l

While this piston has proven itself particularly adapted for use in connection with steam en ines, it will be understood that I do not wish to limit myself to this particular application, as the piston may be aplied in other engines, such as compressors, internal combustion engines, hot air engines, etc.

Having thus described my invention,

what I claim and desire to secure by Letters Patent is- 1. A piston comprising a central cylindrical body, an annular sleeve and hood havino' surrounding exterior grooves, said sleeve being fixed to the body portion so as to form an intermediate, inclosed annular channel, and tubes fixed in the end face of the hood and extending into the channel, said sleeve having ports co-nnecting the channel with the grooves intermediate between the top and bottom of the sleeve.

2. A piston consisting of a central body having an enlarged base, a hood sleeve, the top of which fits and is secured upon the top of the piston body,and the interior of which has a diameter to fit the base of the piston body and form an annular, intermediate channel, tubes extending down through the top of the hood portion into said channel, said sleeve portion having a plurality of grooves around its periphery, and ports leading from the annular channel to the innermost of the grooves. y

3. A piston comprising a main body with an enlarged base, an annular, exteriorly grooved sleeve fitting said base forming an annular channel between itself and the main body, and rhaving an inwardly overhanging portion fitting and secured upon the top of the iston, openings through said overhanging lfubes fixed in the openings and extending downward into the annular channel, and pressure reducers adjustably fitted into the /upper end of the tubes.

4. A piston and packing consisting of a central body, an exterior sleeve with van intermediate closed annular channel, adjustable,tubular connections between the top of the piston and the channel, said sleeve having centrally located peripheral grooves and ports connecting said grooves and the channel, and other grooves above and below said first-named grooves and unconnected with said channel.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM u. Hnwrrr.

WVitnesses Gr. H. STRONG, Zou HARRISON. 

